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VulnerabilityPublished

CVE-2026-123802: supertokens-core · Improper Authentication

Affects supertokens-coreSource CVE Database V5

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Not known to be exploited · CVSS 8.1 High · fixed in 12.3.1 : patch supertokens-core soon.

Data as of 9 Nov 2026, 18:34 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.18.1
Patch
Available – fixed in 12.3.1, 12.2.1, 12.1.2 +3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
supertokenssupertokens-coreAffected
  • >=12.3.0 <12.3.1
Fixed in
  • 12.3.1
supertokenssupertokens-coreAffected
  • >=12.2.0 <12.2.1
Fixed in
  • 12.2.1
supertokenssupertokens-coreAffected
  • >=12.1.0 <12.1.2
Fixed in
  • 12.1.2
supertokenssupertokens-coreAffected
  • >=12.0.0 <12.0.11
Fixed in
  • 12.0.11
supertokenssupertokens-coreAffected
  • >=11.4.0 <11.4.8
Fixed in
  • 11.4.8
supertokenssupertokens-coreAffected
  • >=11.3.0 <11.3.8
Fixed in
  • 11.3.8

AI-suggested

Upgrade SuperTokens Core to one of the fixed versions: 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, or 12.3.1. These versions contain the official fix for the improper authentication vulnerability. No other mitigation is indicated by the vendor advisory.

Description

CVE-2026-123802 is an improper authentication vulnerability in SuperTokens Core affecting versions from 11.3.0 up to but not including 11.3.8, 11.4.0 up to 11.4.8, 12.0.0 up to 12.0.11, 12.1.0 up to 12.1.2, 12.2.0 up to 12.2.1, and 12.3.0 up to 12.3.1. The flaw allows a licensed deployment with a configured SAML client to authenticate an identity from an assertion that does not satisfy the audience check properly, enabling an attacker to impersonate a victim IdP user. This issue is fixed in versions 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1.

References

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